We present a measurement of neutrino tridents, muon pairs induced by neutrino scattering in the Coulomb field of a target nucleus, in the Columbia-Chicago-Fermilab-Rochester neutrino experiment at the Fermilab Tevatron. The observed number of tridents after geometric and kinematic corrections, 37.0 ± 12.4, supports the standard-model prediction of 45.3 ± 2.3 events. This is the first demonstration of the W-Z destructive interference from neutrino tridents, and rules out, at 99% C.L., the V -A prediction without the interference.PACS numbers: 13.10.+q, 12.15.Ji, 14.80.Er, 25.30.Pt A neutrino trident is the scattering of a neutrino in the Coulomb field of a target nucleus (TV),

We present an improved determination of the proton structure functions F2 and xF3 from the CCFR ν-Fe deep inelastic scattering (DIS) experiment. Comparisons to high-statistics chargedlepton scattering results for F2 from the NMC, E665, SLAC, and BCDMS experiments, after correcting for quark-charge and heavy-target effects, indicate good agreement for x > 0.1 but some discrepancy at lower x. The Q 2 evolution of both the F2 and xF3 structure functions yields the quantum chromodynamics (QCD) scale parameter Λ NLO,(4) M S = 337 ± 28(exp.) M eV . This corresponds to a value of the strong coupling constant at the scale of mass of the Z-boson of αS(M 2 Z ) = 0.119 ± 0.002(exp.)±0.004(theory) and is one of the most precise measurements of this quantity.PACS numbers: 13.15.+g, 12.38. Qk, 24.85.+p, 25.30.Pt High-energy neutrinos are a unique probe for testing QCD and understanding the parton properties of nucleon structure. Combinations of neutrino and antineutrino scattering data are used to determine the F 2 and xF 3 structure functions (SFs) which determine the valence, sea, and gluon parton distributions in the nucleon [1,2]. The universalities of parton distributions can also be studied by comparing neutrino and charged-lepton scattering data. Past measurements have indicated that F ν 2 differs from F e/µ 2 by 10-20% in the low-x region. These differences are larger than the quoted experimental errors of the measurements and may indicate the need for modifications of the theoretical modeling to include higher-order or new physics contributions. QCD predicts the scaling violations (Q 2 dependence) of F 2 and xF 3 and, experimentally, the observed scaling violations can be tested against those predictions to determine α S [3] or the related QCD scale parameter, Λ QCD . The α S determination from neutrino scattering has a small theoretical uncertainty since the electroweak radiative corrections, scale uncertainties, and next-to-leading order (NLO) corrections are well understood.In this paper, we present an updated analysis of the Columbia-Chicago-Fermilab-Rochester (CCFR) collaboration neutrino scattering data with improved estimates of quark model parameters [4] and systematic uncertainties. The α S measurement from this analysis is one of the most precise due to the high energy and statistics of the experiment compared to previous measurements [5,6].

A high-statistics study by the Columbia-Chicago-Fermilab-Rochester Collaboration of opposite-sign dimuon events induced by neutrino-nucleon scattering at the Fermilab Tevatron is presented. A sample of 5044 v M and 1062 vv induced /i^/i 1 events with P^ > 9 GeV/c, P^2> 5 GeV/c, 30 < E v < 600 GeV, and

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We extract a set of values for the Gross -Llewellyn Smith sum rule at different values of 4momentum transfer squared (Q 2 ), by combining revised CCFR neutrino data with data from other neutrino deep-inelastic scattering experiments for 1 , Q 2 , 15 GeV 2 ͞c 2 . A comparison with the order a 3 s theoretical predictions yields a determination of a s at the scale of the Z-boson mass of 0.1146 0.009 0.012 . This measurement provides a new and useful test of perturbative QCD at low Q 2 , because of the low uncertainties in the higher order calculations. [S0031-9007 (98)07266-4] PACS numbers: 12.38.Qk, 11.55.Hx, 13.15. + g, 25.30.Pt The Gross-Llewellyn Smith (GLS) sum rule [1] predicts the integral R 1 0where xF 3 ͑x, Q 2 ͒ is the nonsinglet structure function measured in neutrino-nucleon (nN) scattering. In the naive quark parton model, the value of this integral should be three, the number of valence quarks in the nucleon. In perturbative quantum chromodynamics (PQCD), this integral is a function of a s ͑Q 2 ͒, the strong coupling constant.The GLS integral is one of the few physical quantities which has been calculated to next-to-next-to-leadingorder (NNLO) of perturbative QCD [2], and there are estimates of the next order term [3] [i.e., O͑a 4 s ͒]. In addition, there is a nonperturbative higher-twist contribution, proportional to 1͞Q 2 . This yields the GLS integral as a function of a s , of the form GLS 3